Answer:
1763: France cedes Canada and Louisiana east of the Mississippi to Great Britain in the Treaty of Paris. The rest of Louisiana, including New Orleans, is formally ceded to Spain and incorporated as Luisiana or Spanish Louisiana into the Spanish Empire.
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The US Constitution is adaptable because the Founding Fathers deliberately made it relatively vague--meaning that they didn't get too specific because they knew it would have to endure in the future, when minds and society would be greatly different. It's also adaptable because it allows for amendments, which keep the document relevant with modern times.
When one of the branches want more power, yes. But that is why we have 3 branches and checks and balances. We have those to prevent one branch from obtaining too much power. When the president wants a bill to be passed that will benefit the people and the legislative branch doesn't like it or the judicial branch says it is unconstitutional, then the bill cannot be passed.